Took a while to realise that pausing the game is how you buy and upgrade stuff, but when I realised that I went ahead and completed the game (all upgrades and achievements). Very simple idea but it's an engaging game and a nice implementation of the theme!
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Yeah I realized after that I forgot to mention that you can upgrade things when you paused. I'm glad you found it engaging, I thought it might get a bit boring. And I'm glad you liked my take on the theme, I would have liked to implement it more into the actual gameplay but real life happened and I had to scrap all that. Thanks for playing!