First of all, I am extremely impressed that you built this in 3 days, with extra modes, achievements, etc. I can't imagine the amount of time/crunch that this took
The visual effect for the tilt is really cool but it does get a bit confusing on the extreme ends
I really enjoy this and it is tons of fun, but to be fair, I think a good portion of that is because tetris itself is a lot of fun. The twist adds a new dynamic to the game, and I think it makes it more hectic even faster when things start to go wrong which is very exciting and stressful
If tetris didn't exist, this would be the greatest jam game of all time