Pretty neat puzzle platformer! I love the goofy vibes it gives off, and the whole berg summoning mechanic is cool, especially because of the way the levels evolve and recontextualize it in new ways, such as how bergs being summoned from the sky can be used to access floors above you. I got really addicted to playing this and kept wanting more!
In terms of feedback:
*While the game does get a certain amount of goofy energy from its animated background and 'berg' shout, the game is a bit dry otherwise. Obviously it's understandable that juice and pizazz is not given top priority in game jam time limits, but at the very least there could be a bit more effects to communicate elements better, such as how buttons should ideally react in some way to let you know when they've been pressed down, such as playing a clicking sound or getting squashed or greyed out, as without that, you could think things like "oh it isn't pressed yet, maybe I need to weigh it down with a different berg, or pile bergs on it?"
*That one level where you need to jump up and over a wall that looks like you couldn't but you can because it doesn't extend out of the screen was very weird: not sure if it was intentional or a glitch. Looking back on it, I think I could've gotten through it a different way if I knew how to use the summoning powers differently.
*I was having fun playing but needed to take a break due to the larger amount of content than I anticipated, and upon returning I was disappointed to see that it didn't save my progress or offer some sort of level select! I like the game, but not quite enough to play through it all over again just to get back where I left off.
*Some of the solutions relying on RNG giving you the berg you want can be a bit annoying at times, though typically I can improvise and find it fun to do so (but that's only because I haven't been unlucky enough to be screwed over yet, haha)
Berg!