I've actually seen this same concept a couple times in this jam, and, I'm sorry to say, the others did it better :/
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Nothing's truly bad, it just isn't as creative as other submissions have been with the theme of "shape-shifting", in the context of switching between geometric shapes. There's one that's very similar to this--switching shapes to escape a cave--in which the different shapes are the main approach to solving puzzles themselves, where in yours the shapes hardly matter...platforms, gates, and walls only appear or disappear based on what shape you're playing as. In your game, you could replace the shapes with any other graphic--like playing Super Mario 64 as Mario, Luigi, Yoshi, etc., whereas in the other one the shapes themselves are an integral part of the game.
As I said--your concept isn't bad. Super Mario 64 is obviously a very good game, and that's why I used that comparison--this game could be successful if it weren't being compared to a different one.
Another game sees you switching shapes in order to attack enemies: you can move and jump as a square, but you take damage. You can only dash forward as a triangle, but you deal damage to enemies and walls. You have to alternate between them in order to complete levels.
That game is roughly the same as yours except for one key aspect: the logic for how different shapes alter the game. In yours, the different shapes themselves act as "keys" to various "locks", except you only have to switch to a different shape in order to "unlock" that shape's gameplay. There's another step of interactivity in the other one: if you just switch to a triangle at a random part in the level, nothing happens--you dash forward, and then turn back into a square. You need to target your dashes at breakable walls and enemies in order for them to be effective. It's not an automatic change, it's one that the player has to do themselves.
So that's why I said that other games have done better with this theme (granted, I was also exhausted from a long day at work at the time, and in hindsight I probably shouldn't have been as harsh with it). Does that explanation make sense?
Also be aware that these are my own personal evaluations of the games in this jam. Anyone here can disagree with me, and that's okay.
thank you for the clarification, I personally did take offense with the first statement at the beginning, however the long comment makes up for it and I would love to know the names of those games so I can give them a try. I worked on this game alone and it was my first time using unity so I definitely hope to improve the game over time, I mean when I first submitted the game I had absolutely no sound or music but quickly got a comment saying you definitely should add sound so I crunched hard to find some sounds that worked and added them. I look forward to giving your game a try later this weekend ,the comments make it seem really good.
Oooooh let's see. One was Speleomorph (here) -- that's the one where changing shapes is the main puzzle-solving mechanic -- and then Shapeshift Shatter (here) -- that's the one with the triangle dash.
Props to you for doing what's necessary to improve! And, again, sorry that I came off so strongly at first :/ my bad lol