Cool game to spend time playing around. The mechanics are simple and easy to understand, and is one of the few games with somewhat an original concept.
The gameplay itself is pretty good. Only things I think would be worth improving are the menu screens and the art style.
The first one is because they are kinda simple and seem to have the "default" font, which sometimes can be good but another font would give a better impression.
The second one is because it seems like you are kinda unsure of what you wanted to do. The alien looks pixelated, same as the fruits, but the fish and the menu screens aren't. Also, even when there are pixelated things, some things clearly have more pixels than others. The orange has way less pixels than the lemon, and that makes it odd because they have different image quality.
Considering everything but that, the game overall is pretty enjoyable and is definitely a creative concept.