I was just trying to play the game through the indiegala play page-- even before I could choose how I wanted to play, I discovered a glitch.
When I first opened the window, my mouse cursor and the cursor in the game were in agreement. But when I scrolled the window a little to better center the game's frame, the in-game cursor also "scrolled up" for lack of a better term. That is, it was still in agreement with my cursor in regards to left-right positioning, but the in-game cursor suddenly thought the "bottom" of the game's window was different than the actual location of the window. I'd scroll my cursor into the game window from the bottom, and rather than entering the frame from the bottom, it would instead appear some distance up the game's frame. This is consistent no matter where on the bottom I "enter" from, and if I try to move from in-frame to out of frame, the same jump happens in reverse. However, if I scroll down the browser window to re-position the game's frame in the positioning where it started, then my cursor and the game's cursor agree again.
However, this is all a pretty big problem: if the "jump" is far enough, then the in-game cursor can no longer reach the buttons to read the rules, start the challenge, etc. It makes the game in-operable. Further, it is not immediately obvious how to fix it-- it was only luck that I realized it was connected to the scrolling, and I was actually on my way to exiting out when I noticed it.