Glad you enjoyed! One of the issues with the game was definitely a lack of visual clarity on both buying and attacking spending your POWER meter; Something we had planned to address but too many issues clogged up our time before the deadline. :P
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I definitely understand deadlines sneaking up on you. XD
I saw other people were perplexed by the shop system and I understand that it could probably be reworked. However, I think it's a really interesting idea, deciding if you want to upgrade and go into a level with really low health, or play more conservatively and risk being to weak it the later game.