This game is really addicting, and I enjoy it a lot! Well done. I tried to play this on a tablet, but I got the WebGL not available thing, so I had to play on my pc. I am guessing it's my fault though.
It's the API the game runs in, some devices don't have it installed. You can download and intall it with this link (if your tablet is compatible):
You can also download the .apk file if you want to play it on an Android device.
But I think the PC with mouse version is better.
Really happy to read your comment, I'm glad you like it! :D