Damn, my first comment, thank you soo much! Anyway, currently fixing that collision issue, it happens when touching two or more blocks at the same time, I'm still not done sadly. Due to lack of time during that time.
Also, the enemies, I intended on making them run past to finish this project quicker, and that enemy at the last, I've played tested it, I'll check make sure it works. With that, I'll make it more obvious that you got hit, add knock back if I can, and see why that last enemy didn't do anything.
So thanks for playing the game in the first place lmao. Really appreciated!
EDIT:
Right the sounds, it's my first time implementing sounds in Java, I'll try my best to implement it and do some sound design, heck yeah!