Ok- the first thing you gotta tell the players is the objective of the game! I finished all the waves, and THEN found out that I'd get more points if I had more money!
Other than that- the game was fun, especially when I started to play without powerups! The graphics were simple, but the "multiple squares" type of animation was cool!
The music was... a bit strange, but id didn't bother me. The game could use some more sounds (jump, death- standard platformer stuff).
A thing I liked the most was gameplay variety. For a seemingly simple game, you had a lot of enemy types, and gameplay mechanics. In my opinion this bumped it from "simple platformer" to "LET'S TRY TO BEAT MY SCORE"... no success here so far :)
As always- I love the inclusion of online leaderboards!