This is an unimpressive a pretty decent game! ;-)
Here is some personal feedback!
POSITIVE
- Simple but nice graphics
- Good music and sound design
- Direct and good controls
NEGATIVE
- Goal and setting of game not explained in the game anywhere
- Platformer controls are not required for winning, you can just stand on the middle platform and shoot left/right
- Enemy Death animation is unclear (doesn't communicate that the enemy is dying)
IMPROVEMENT IDEAS
- Enemies should could stop movement when they die and flash bright when they get hit