Simple but cool.
As I said before, people like blobs.
Here are some things that you can do for better sequel...
1.Improve graphics
2.Add some basic objects like walls, blocking blobs and you, water making your movement slower,teleporters for teleporting from one room part to another room parts seperated with walls and other enviromental hazards.
3.Make more levels and each level would have their own enviromental hazards.
4.Add some more types of blobs like blobs going zig-zag or spiral style, even some kind of 'boss' would be good, also for '25pts' blobs would spawn more often and there could also be '50pts and '100pts' blobs.
5.Some kind of powerups lying on the ground making blobs movement slower,stopping them for some time, making you faster, making blobs close to you moving towards you etc.
But this is still great game, congratiolations making this and good luck for sequel!