Nice game! I included it in my compilation video series of all of the GBJam 5 games, if you'd like to take a look :)

This seems like a good idea but in practice I found it very difficult to understand what I'm looking at. It seems like it would have made a lot of sense to have the sky look different then the ground. Also, it's just very difficult for me to hit anything, I'm not sure I have. I died and it went straight to mission 2. It would be great if you could polish up the graphics a bit so players can see what is going on easier.

Really cool gameplay, doesn't feel much like gameboy, but the upgrades and stuff are cool. Maybe you can make the radar be able to see rockets and enemies in early stages, it's a bit difficult.

Pretty decent time killer. I probably didn't play strategically by just ramping up fire-rate lol, but it was fun. Looks ok, actually, I like that you can see the rocket trails. Neat game!