Fun: The concept (ba-dum-tsss) of the game seems good. However I feel like it still needs some polish. The platforming is very tight and the player's movement seems too fast. I feel like I can barely predict where he will be at any point in time. The swinging physics do not help. When I'm swinging I move faster then when I'm just in the air and it does not feel like a fair pendulum. Maybe I'm just not used to the controlls, but I would suggest you looking into that to make everything feel more consistant. The jump also is weird. It feels like the hight of the jump is exponentially proportional to the time I hold the button. If i just tap it I barely jump, but if I hold it a bit longer, the player is in the stratosphere. I'm obviously exaggerating, but you get the idea. One more thing is the fact that some moving platforms are climbable from below, while others aren't. It's hard to tell at a glance which is which and I'm not quite sure why was that necessary.
Visuals: The sprites are not consistant in resolution. It looks bad when the 16/16 player character sprite is the same hight as a 64/64 (or something) object in the background. Take for example the first screenshot and what do you actually see in the level. On the screenshot it looks better. Also in the same room, in game you can barely identify what is the background and what is the foreground objects you can land on, while on the screenshot it is more readable, but not that much.
UI: Perfectly functional, I have no notes on that part. Maybe just add a bit more visibility to the controll hints. It was fine for me, but I almost missed them.
Sound: I mean, I like the Mass Effect and Hollow Knight soundtracks, they do sound good, but are you sure you'll be able to license them? MAYBE Hallow Knight, but Mass Effect? Are you aware that EA sued someone because of the fire png on some game's logo? Not even the same they used in their game. And that's only the tracks I noticed.
Overall: The game still needs polish. I did not read into the story much, but I think it's alright. I got stuck on one of the levels in the lava area after finishing the previous available one and couldn't figure out how to proceed. The only grabbable object was to far away and behind a wall and I couldn't jump to the other platform. Anyway, good luck on the project!
Edit: gramma
Viewing post in Concept jam comments
This is awesome feedback, really appreciate you taking the time to give it a chance!
Re-doing the swing physics has been pretty consistent feedback the last few versions and I think that will be my primary focus as of now coming out of the jam.
Most of the music in the game is definitely placeholder and I'll likely replace once I have a better idea of how much I'd like to spend on licensing. For now, I'm just using some of my favorite tracks that atmospherically match the vibe I'm going for. This is very much in transition from a hobby made fan game to a more "real" game and there's a lot of that still heldover for sure.
Thank you again for the feedback!