This is a neat concept.  I think it could benefit from more playtesting.  I was unable to get past the 4th level.  (And the first three, you can get by without doing anything but pressing the spacebar.)

Instead of explicitly checking for the W, A, and D keys, consider using `key.axis("Horizontal")` and `key.axis("Vertical")`.  This will let your players use WASD, or the arrow keys, or even a gamepad.

The motion felt good once I discovered the controls.  It's slippery, but I assume that's the intent.  I think if you had maybe a half-dozen easier levels before level 4, so I could feel like I had some success and built some skill before hitting that one, this would be a fun game.

In any case, it's a really impressive effort for your first MiniScript game (and I know you had some toolchain troubles at first).  So great job!  I look forward to seeing what you create in future jams!

It's tricky, but the movement feels pretty smooth to me. Fun music and background effect too!