If there is a feature missing that you like then make it. He made it open source on Github. I cant stand when people put out a project for free and everybody acts all entitled without lifting a finger to help.
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He's posting it on itch.io for donations, I assume that means he eventually intends to make money on it. I'm not gonna do his work for him and contribute to a project for someone else to make money on. I contribute to Open Source projects that aren't monetized. Besides, it's in alpha, I'm giving my feedback, so apparently all feedback is entitlement now? Plus, how is it entitlement to want a feature as basic as deletion? Look you can get off your high-horse and stop being a dick to people requesting features in a product that is in alpha specifically to get feedback.