I like this game. Simple but fun to play! It takes a bit of time to get used to the controls, especially the button to switch gravity which isn't in the most comfortable position. The boss fight is nice. I like the fact that there are multiple phases and it gets harder towards the end. The sound effects are fine, but some 8-bit background music would have been a nice addition :)
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I would probably use shift to shift the gravity and a key on the right of the keyboard to shoot (like J, K or L). I like to use my left thumb for WASD and the jump on the space bar, and I don't want to move it to the V key, especially in sections where you need to jump and change the gravity quickly after.