This game has a lot of potential, and I enjoy the premise of it to some degree. However, I personally find that the controls are a little disconcerting, not only with the fixed angle for a bomb throw but also with the use of W for jump. This kind of makes jumping up as needed to move past the starting stage very difficult, and in a platforming game, especially at the start comfortability and intuitiveness with movement are pretty major things to keep in mind. One last thing is that the disappearing spike is a little too tricky to figure out since there's no indication that there's actually anything to do there and, with a timer, can be more difficult to manage, especially with the odd platforming to get there to begin with. A fix for leaving players confused at this section is to imply the disappearance and reappearance of the spike, either by showcasing it somewhere earlier in the level or giving it some sort of visual flair (i.e. flashing? different color? etc.) to alert the player to the fact that something about it may change soon. Otherwise, its a lot of trial and error.
The artstyle was cute and simple, reminiscent of games like Geometry Dash or Cats are Liquid. I think there's a lot that can be done with this game, like the simple addition of some sounds/music to make it feel more immersive and letting the bombs be a little more free + have a little more purpose. If there's a way to get past the first area, then I haven't found it, but I'm sure that there being an ending at all would be more reason to play this game than not.
Great job on your first jam game!