Fun little game! It took me a second to figure out how to start the enemy waves, but once I understood, it was genius! Getting the ships in place was a really cool way to teach the player about movement and transition right into gameplay. Also really liked the spacey art style. That, paired with your audio, gave off a great retro arcade gaming vibe. I liked it. Only thing I would've wanted to see is a single player mode (maybe I just couldn't find it?). The co-op approach is really fun, but trying to control both at the same time without a partner was a bit tricky for me. Aside from that, the difficulty progression felt very well thought out - started slow so I could feel out the game, then you introduced more complex enemies with new waves. Overall, great work!