Morphblade

In Morphblade you move around a grid slicing, smashing and bursting waves of nasty red bugs. Each tile you move to transforms you into a different weapon: on a Blades hex you can slice enemies on either side of you, on an Arrow you can launch yourself through two enemies in a row. Between waves, you choose how to build out the grid, and upgrade your most used hexes with new abilities. Upgrades can even be stacked, so you can end up with an Arrow that propels you with infinite range, kills everything in your path, penetrates armour, knocks back everyone near your destination, heals you, and doubles as a teleporter.