Space Defender

The Earth is under attack from alien gun-drones and you are its last defender! Try to survive each level for 30 seconds by avoiding the enemies' missiles or shielding against them with your force field.

At the end of each level, you can choose to upgrade either your force field (reducing its cooldown and depletion rate) or your thrusters (increasing your movement speed whilst slowing your enemies). Can you survive for all 5 levels?

Controls:

• Hold Up: move up
• Hold Down: move down
• Space: use force field
• Up/Down: change upgrade option
• Enter: select upgrade option
• P: begin level

This is my submission for the 2022 Nokia 3310 Jam, created using the DragonRuby Game Toolkit. Thanks to Trix for the sound effects.