This is a very neat platformer, I liked the idea of having to build a level with random parts to reach the finish line on time. I struggled pretty badly with the time limit on the last level, but I was able to beat it after exploiting a bug that I found :-). I think it would be really nice to add some kind of ghost/outline that shows what piece you rolled as a reminder to the player, and you might consider an "easy" mode where you have unlimited time but every time you roll the die you lose points or something.
It looks like you're planning to work on this more after the jam, so here are some very minor bugs I ran into:
- Clicking to place an object before the die finishes rolling seems to always place the 1x1 ground tile, so this made it easy to build platforms. I could even roll, jump, and place the platform under the character to climb up.
- The timer doesn't stop when you reach the end of the level, so I got a win message followed by a loose message when I finished with one second left.
- My laptop's resolution is 2736x1824, and the die UI element was almost completely off the screen on the first level. It was fine on all the levels after that though.
I think this game has a lot of potential, and I can see how it would be a lot of fun with a few small quality of life improvements and more content.