BTW, I found your game on Medium article.
I have tried your games many times, but level 2 is not hard, but based on 'Luck', I have reached the end, and its always those 8-10 tiles which are left. It looks like only 1 tile, but have infinite tiles under them.
In the beginning it was competitive, that I tried it again and again, but after realizing that the end just depends on luck, I'm not trying.
To improve this and make players less frustrated is to either change the level 2 or you can have a '%' meter, which tells players how many total tiles are left to complete the level.
Seeing the '%', e.g. 78%, will tell players how much is left to complete the game, and they may not give up and try again.
I'm a game designer, if you want my help with improving the game design or are working on a new project, let me know.