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Okay how on earth did you make this in month, there are so many rooms and upgrades, 2 hours in and still heaven't find all the codex. The enemies are very cool too, i like how all the enimies changed after the boss. 

Overall really fun and complete game! 

Thanks! The short answer to your question is 'good tools and a good process' but I plan to write an in-depth postmortem later ;)