Game is okay, but the screen feels waay too cluttered - it's hard to quickly distinguish what's background, what's an enemy bullet that i'm supposed to avoid and what's a collectible that i want. If the background didn't have bright street lamps and was overall darker and less vibrant, the actually important things would stand out more. The fact that things have an outline is good, since i can easily tell green=good and red=bad, but the problem is that the outline slowly flashes between white and green/red, so if i see an item with a white background, i don't know if it's good or bad.
And in general everything feels like it's too small. If everything was scaled up atleast 50%, it would be more noticable and easier to make out in the mess of colors.
Gameplay-wise, all enemies seem to die in one hit, which makes them feel more like annoying flies than worthy opponents - i think less but stronger enemies would be better.
And, ofcourse, the lack of sound makes the game feel... disconnected. Even a few simple sound effects and some music would go a long way.
The art, however, is great! It just feels a bit wasted...