Greetings Lieutenant,

The space station Terra-01a is under attack.

Since you are the only certified pilot aboard the station, it is your duty to hold them off until backup arrives.

The enemy will most likely try to destroy the four ports of this station. Defend them as best you can.

This station must not fall into the enemy hands.

The PF-01 fighter you have is an advanced model. The controls however are standard:

You can use the <UP> arrow to power the thrusters and if you need extra boost you can use the <Z> button. The <DOWN> arrow will instantly rotate you against your direction to assist with control, while the <LEFT> and <RIGHT> arrows will rotate you.

The <SPACE> button fires the main cannon while the <X> button fires the plasma cannon.

You can recharge your ship on top of the respective ports. The <C> button activates the tractor beam to assist with the landing.

Good Luck Lieutenant. We are counting on you.

Extra Defense is a game made with the GDevelop  game engine ( for the Extra Credits Game Jam. I hope you like it...

-- Post Jam Update 2--

- I demoted the player from commander to lieutenant. Not because he couldn't get past 120 hits, but because i figured the rank was wrong. He has to start from lower.

- Auditory and Visual warnings for the ship levels.

- New and improved HUD to make things more clear.

- There is now a tractor beam that when it collides with the ports it can transfer you to them for recharging.

- More VFX and SFX in general.

- Plenty more to come after the stream.

-- Post Jam Update--

- Added sound fx for hit counter, plasma cannon, charging and transmissions.

- When a port is destroyed the enemy fighters now are chasing you.

- When you run out of fuel the game does not end instantly.

- Plenty more to come after the stream.

GenreAction, Shooter
Made withBlender, GIMP, PixiJS
Tags2D, Arcade, extragamejam, gdevelop, Space
Average sessionA few minutes

Development log


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Sweet. That was fun. Got up to 105! Controls took some getting used to but once you figure out how to use the down arrow you've got it.

Ok, that is impressive... The most I got is 120... thank god i didnt insert a leaderboard.... Did you get to check any of the messages???

I think I got one. Do you mean when it says that back-up was delayed?

there are about 8 of them showing up at various stages... I will add a voice over on the post-post-post jam update to make them stand out...

That'd be cool. I think I only got the one but I was pretty focused on the action so it's possible I missed others. Having it be voiced over would definitely resolve that. 

Very challenging (in a good way). 

Thank you for the feedback... When i am on a pc i will be sure to check your dino game too...

Really enjoyable challenge, great job! I think I may have found a bug though: if you press down to rotate instantly while moving,  boost forward for a second and then  let go of the up arrow key, the ship will start accelerating backwards. If I had to guess, this might be because the acceleration gained by the extra boost is track separately from the normal acceleration.


Glad you like it.. 

the thing is that you only keep the speed with  the thrusters while the <z> boost will give you speed while you keep it pressed. It goes against space physics but you know... 2 day Jam... 2 day space jam... and not the one with michael jordan...

Control wasn't particularly easy. Back button may also give thrust, so that it is more intuitive.

Extra hard to just go and get supply. Perhaps Make the supply area bigger so that it tolerates more mistakes.

But to make it really fun, how about a tractor beam to slowly snap player into the bay? Perhaps make it an upgrade too

But general gameplay is quite interesting. The need to go back for supply is fun. Just wish it will be more rewarding because to just go back is already quite a challenge

(and me too. i did not realize the icon's dual purpose as the health bar of the base, until late into the first game. Good thing is that i noticed it before the second play-through)

Thanks for the feedback... The controls should get easier when you practice a little. When I started it I wanted to have real-space physics which is why once you get speed with the thrusters, it stays... I will definitely work on them more..

About the charging, someone also mentioned it in discord and i thought of a tractor beam that if you press a button on top of a charging port it freezes while you keep that button pressed and charges... If I add missions in the future this would come handy for picking up things too...

Even just having a button that functioned as a brake might do the trick there. For me the tricky part isn't getting to the recharge stations but not drifting away too quickly.

And now the tractor beam is implemented with the <C> button... And the HUD is (hopefully) more clear... Try it out if you have the time...

thanks for the quick update! i ll try it once i m out of work

i love this game but I didn't know where health of the stations parts were until after sometime still really good mechanics really good game

Thanks for the comment... I made the HUD graphics at about 2 hours before the jam ends so in future updates they will be better...