Really fun concept, works really well!
If you plan to update it in the future my requests would be to add wall kicks and allow for custom controls. I know you added many options already, but it would still be nice to have

Amazing job, well done!

ok, i got a score of over 14,000 ... I think i played for over two hours .... So far ;-)

This game is absolutely amazing! Thank you so much!

The only three little details i would suggest is making the 'blocked'blocks a bit darker or something, they resemble the lighter block, its a bit hard to see the difference. Also, maybe add a bit more delay between collapse and tetris phase, so that we can switch from mouse to keyboard. Lastly, i was wondering: maybe you could create a thumbnail that shows a bit more of the game?

While i kept playing and playing, i was trying to analyse why i liked this game so much and which lessons i could take from this. Here is what i came up with:

- it starts small to introduce the different game mechanics. 

- the tetris movements are pretty forgiving which is a real life saver in a lot of cases.

- there is a rather stressful tetris phase that is interrupted by the collapse phase (in which, i believe, you can take your time and it doesn't make a difference, right?) This lets you breathe for a second, i never realised this might be important until i saw it here.

- even though it is a game of strategy/puzzle/speed/reaction, there is also a bit of luck involved. To a point where, even when all hope seems lost, you can get a lucky combination of special blocks and regain some ground. In most of my runthroughs i ended up with a pretty full map each round, however there was always one 'tunnel'left where you could squeeze in an i-block, which gives you four lines all of a sudden with means loads of special blocks. Long story short, it is incredibly well balanced.

Again, thank you and congratulations on such an amazing game!