overall not bad, i can see the ambition with multiple levels,
couldn't pass the mine level tho, and some levels are lacking instructions

To be honest, considering what you were aiming for, it was a pretty tedious experience. I didn't feel challenged or motivated by the levels, since the collision detection is really buggy—and on top of that, the mine level is impossible. But overall, it's okay.

Hey, from reading the description I understand that you planned to/added a variety of levels to the game. Which is ambitious for a game jam. But keep in mind that when you do that it becomes more likely that a break in the sequence ruins the whole play session. For example - a player gets stuck on level 1 and can't experience the other 3 levels. For that reason it is a good idea to include a menu which allows the player to select the levels. That way you guarantee that the player gets a chance to experience what all that you made. 

Good luck!