I managed to make it to wave 11 before dying, I eventually got cornered and had no place that I could run to anymore. Anyway, this is a pretty decent start to a game. You should experiment with adding a lot more game juice such as shooting effects, particle effects, animations, bullet variations and sizes, post-processing, etc. A secondary movement ability such as a dash, a grapple, or a teleport could go a long way in making the movement feel more involved too. The shop upgrades were nice, but I think the health and shield upgrades were a bit too expensive to reliably go for. Damage output is extremely important for staying alive in the other waves.
The aside, this is still well made, good work :)