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Relatively simplistic tower defense game with old school graphics (and music!). Doesn't really have towers per say, but that's essentially what your placed units are (can choose up to 4 different unit types, two melee and two ranged).

Considerations worth noting:
-When your unit dies you can't place a unit in that spot anymore.
-Player units don't appear to get upgrades (enemies do!).
-Once units get past the top 2 or bottom 2 rows there is nothing in your "castle" that will oppose them and it doesn't look like you can place units in the castle.
-Player has to manually collect "blood" i.e. the heart icons on the screen before they disappear.

Not bad for a first game, looks to be improvements made in subsequent related titles.