I didn't realize I had left the minecraft style inventory in the release. It's still in development. All of the blocks should be in your item inventory (same one for powerups), and you should be able to see it by pressing " - " (minus) while in game. The yellow block is an "aimer" that helps with block placement. Ill make a tutorial text in zdoom forums later, thanks for the suggestion!
QwertyKing7
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