I played the browser version in chromium (87) on Linux. I think I bug-finished the previous level, and then this one had some wrong state.
Now I tried it in firefox and it worked very well. Completed 12 levels. By far the best game so far! Love the details (like when you step on a box in water, beautiful!) Only criticism I have is that controlling with WASD is very confusing, died numerous times to that, but controlling with mouse was fine. Great game!