Loved the atmosphere with the acid rain, and the projectile vomiting robots were pretty funny.
Potential Improvements:
- If you can't buy more than one thing in the shop, they shouldn't offer the same thing twice (especially not for different costs)
- Homing shot should probably disperse after a few seconds (though it was fun to intentionally fire into the air and have the bullets boomerang back into the bots)
- Either add lives, or checkpoints should restore you back up to a minute of time (sometimes I intentionally killed myself after hitting a checkpoint with low time remaining)
- Stronger bots should drop better energy cells (My default strategy was to tank my way past the big ones until I got a bullet price discount since I felt it wasn't worth the bullet and time investment to take them down properly)