Decent game. It's a standard block puzzle and one feature I can see stand out from other games in the market is its ability to eliminate entire rows and columns.
I reached level 18 and so far there doesn't seem to be a way to lose the game.
It'd help if the player can choose difficult level from the start instead of having to go through easy ones first. If there is a difficulty curve, it's very slow.
Odd color choices for the first 10 levels. Dark Brown, Dark Yellow and Olive Green. These aren't exactly vibrant colors and they don't feel inviting enough to keep the player invested.
Music is great. The mood is perfect for a puzzle game and considerably upbeat.
It's great for a prototype but honestly, you may need to choose a theme instead of just colors. If you're going for colors then maybe have them look like shiny globs of paint instead of the default squares.