Worth your time and money.
This game is both challenging and rewarding. Ranking up is a little time consuming... The gameplay is essentially a first person shooter mixed with tower defense. Every weapon and piece of equipment are upgradeable with unique upgrades. For example, I once upgraded the hammer only with Radius Of Explosion upgrades to make its damage radius three or four times larger than normal. In addition to these things, they have competitive and cooperative multiplayer.
This is my first review.
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Block Fortress, v1.6