Cool little game! I was confused about how the radar worked at first, but once I figured it out everything else felt intuitive. I like the sound effects for locating an item!
That said, when restarting the game one of those survival wave crabs didn't despawn, so I started the next round by stepping on one. That or I got REALLY bad spawn luck for that second round.
If I had any critique, aside from the too-small text everyone else mentioned, it's that the items were placed a bit too far apart for my tastes. Walking around the outermost edges of the map because all the items were laid out in different corners was... a bit much. Especially when I started ignoring enemies and the "enemy approaching" sound got spammed over and over until I took them out, or when no enemies appeared at all so I was just wandering an empty wasteland.
I like the visuals and designs, especially those slime enemies (they remind me of Grimer and Muk!) and the little robot guy giving you tips at the ship! Really nice work on the sprites!