Nice game! I think the optimal play is to have only two offensive elements (since they are basically the same, I just want to alternate between two of them). Maybe if they had different identities, the choice would have been harder. I only played 3 levels, maybe later there are differences.
I really like the Input system. It is so fast to execute the actions! The display is very simple yet very good at presenting all I need to know.
Good job :)