Yep aware of all of these issues and can clarify on all 3: game was submitted earlier than planned as I have been unwell and would have likely not finished had I tried to keep going.
- The "radar" isn't a radar, it's sonar and like real sonar, it updates the positions of detected objects as it pings (using sound), I do understand the frustrations there but it was functioning as intended, the spawning would likely need more tweaking over the Sonar system
- Regarding the music I did make a seamless loop, but when using the recommended format that GDevelop needs to support iOS (AAC) (as game supports mobile), it was always playing with a small jarring gap, so I decided to compromise and add the fade in and out. It's better than it was in that case.
- Regarding the collision boxes this is 100% the case, they are not the best right now, I did get advice from a friend as to how to improve them but between being sick I didn't have the time to potentially break the game remaking the objects with separate collision shapes with the potential to not make the deadline (combined with feeling rough health wise).