Great game with a polished feel. The art style is well done and you have a clear gameplay loop. I like that you have upgrades, it gives some motivation to keep going back so you can become faster.
Some feedback:
- Sounds effects would bring this game to the next level.
- I agree with other commenters that the controls are not intuitive and have a learning curve. An option to invert keyboard controls or even an option to use mouse instead would be great.