Well made and addictive. I do feel like I've seen an awful lot of near identical games to this recently though. Clicking on the mice to gain a deletion is nice, but maybe another gimmick would help separate it from the crowd.

What's there is good, just wish there was maybe just one or two original features

A good idea and well made. It's an interesting challenge too although one I think might be a little beyond me.

Would prefer that I didn't have to use mouse on the menu and keyboard in game.

The most obvious suggestion I could make, which you have already thought of of course, is more types of game. It doesn't take many plays to feel like you're playing the same ones over and over.

It's okay but could do with some polish I think:

If the game is controlled by keyboard, it would be better if I could control the menu using keys as well. Annoying switching to mouse to retry for example.

Snakes can be difficult to see, maybe think about help them stand out

You could do more with the collectables. Maybe lay them out in a more aesthetically pleasing manner. Also would be good if maybe there was some kind of combo? If you keep them coming at a consistent rate that could work. you could have floating ones, moving ones etc..

Overall it's promising and has its moments, but with a bit more thought and polish you would have a much better game on your hands.