*NOTE TO PLAYERS - This game requires more than 1 playthrough*
** SPOILERS below **
Ok, First off this is a deceptively clever little game. It's almost too clever, because I almost gave this a lower rated, and moved on. However, I was pleasantly surprised I didn't.
CONTROLS - There is something a bit off about the player hitbox or the platform hitboxes. Either the player has a rounded bottom edge, or the platforms do, but I kept sliding off platforms that I seemed to be successfully on. Which made some frustrating jumps later on.
STORY - We pretty see 3 characters in the game, but we get no information about what is going on, or how the characters are related or what's going on. There could be a bit more depth of the story, since there aren't necessarily "enemies" we really need more information about the plot to help drive the story and player. I'd recommend this game is well suited for giving us plot text, as we progress through-out the game.
FRICTION - Friction needs minor adjustment, this or hitboxes aren't square, but either way when i'm landing at a slight angle, It feels like i'm sliding a bit too much, and given the precision you're demanding at the later stages, this needs addresses. Its not a huge issue, but could use minor tweak.
GRAPHICS - For me personally the backgrounds are way too busy. I get that they are setting the mood that this is an old mansion or something, but you could reduce the contrast of them a bit or add in just a hair more detail. It works as a simple platformer, but there's a lot of room for refinement and just a bit more variety in all of the platform and background sprites.
CONTROLS - Also let "W" be jump.
FIRST Ending, I think the "changes" that happen to the menu at the end of the first playthrough are not quite enough, maybe "PLAY" only happens to first start the game, and after that it's replaced with something else like "CONTINUE" or "KEEP TRYING" I'm just suggesting to make it a little more obvious the game isn't just over and reset, because, there are games that do actually glitch after you've beat them once.
SOUND - I didn't notice any BGM or SFX, these could be good triggers, like your initial menu music after the 1st playthrough becomes slightly distorted and so forth. They add a lot to the music, your game would essentially want 3 versions of whatever music you get, each being slightly more distorted to reflect the current game conditions.
Overall it's a fun and challenging game. At first it was so easy that I just kind of laughed wondering why you could even bother to jump in mid-air, BUT, I quickly realized this game is pretty deceptive, and has some very difficult challenges. It could use a lot of polish and more variety in block sprites, and just a lot more story, but I like it, and look forward to more!