Pretty fun game! Really felt like an old school game from the GB / nes era. Movement was pretty solid, kind of. Did notice some jumps where annoying to make and felt like i should have made others but at least i didn't find any death pits so not the worse. The biggest complain i have is swimming. Prior to finding the rebreather it was great. The sluggish movement worked well with managing your air and finding the safe pockets to restore it. Then you get the rebreather and that danger of running out. So you are just slowly moving and floating downward to get around. It just made swimming boring afterwards and dreading any parts with it. Not cause of the danger but how boring it was. I think adding some kind of movement speed once you get the rebreather might help that part out. overall though i did enjoy what i played.
Glad to hear you liked the swimming bit, i wasn't sure how it would go over. I do agree that it gets boring once you get the rebreather. The thinking was that it's a bit out of the way and the player might not find it. I'm wondering though if instead I should just make it so that the rebreather doubles your breath timer, thus it's easier but there's still risk.