Yep. #3 is definitely Pac-Man 2: the New Adventures, one of the most underrated games out there.

I have no idea what RP2A03's game is.

Anyway, here's a few more from me:

#4 - I always wondered why the ship can only take one hit but these attached tentacles (which must be made of the same material) are basically invincible and can even block shots. They're good against eyeballs though.

#5 - Never Forget Me. The Moon is Your Friend. W-E-E-B-L-E F-A-L-L-S D-O-W-N

#6 - Somehow this suit can use its occupant to swing around and yet he survives despite that its apparently the suit that depends on said occupant rather than the other way around. Probably best if you don't take it seriously. The creators clearly didn't.