This game glitches and the music is overlapping.
So I played through the whole game, the movement is so glitchy and I would get stuck often on the terrain. The arrow keys also move the screen which is very annoying. Shooting only affects one enemy, you should make it more clear if an enemy is invincible. Animations are also glitchy as well. The music isn't great either, I had to play on mute because it sounded like someone was constantly banging a bunch of instruments on my ears.
This game needs more polish and more work. Don't get disheartened if you see reviews like these. This game could be better, with a bit more fine tuning and polish and this would be a decent game.