Thanks for the detailed feedback ! The mouse cursor was expected to show because I use the latest version of Gosu where this rule was changed... it may has been safer to include this line though on a gosu oriented jam where users could have previous versions ;)
I know that some box could be stuck on the entry point, I didn't have time to figure that out unfortunately.
Speed should have increase with time... maybe in the dropping boxes that could start to drop faster. I thought about that but ran out of time. Using the keys instead of fast mouse moving could have helped to deal with that.
Thanks a lot ! :)