Arrow keys to move
LMB to shoot
You get 1 Skill Point (SP) per level, you can use these skill points in the upgrades sceen after you level up.
Upgrades:
+1 shots/s: 1 SP
+1 laser pierce (go through more enemies): 2 SP
+36 (1.5 tiles) laser homing: 3 SP
After vanquishing an enemy you will get score and xp as follows:
Bugs: 30 XP and 150 score
Flies: 50 XP and 300 score
Red Guys (player but red): 70 XP and 500 score
You can only hit bugs when in a 10.5 tile range of them
Flies fly around you
Bad Guys jump AND have 5 HP
You have 10 HP, taking 1 damage each time you're hit. Once you reach 0 HP, you lose.