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Sorry, the app was created many years ago with an ancient version of Game Maker Studio for which I do not have the license anymore. Purchasing a new license, updating the project and libraries to a modern engine and upgrading the game is not feasible for me at the moment. I hope you understand

Yes, the app was compiled with an old version of Game Maker Studio, that's why Android complains. But the app itself is totally safe

Hello! I wanted to notify you that the deckbuilder program has been updated and I implemented all the suggestions you mentioned. Enjoy!

Also, let me know if you have further constructive feedback

Thanks a lot for the constructive feedback! This is all very useful information and I will definetely follow your suggestions. I agree with you that the decklist UI is not the best and I should improve the whole UI. The tool is derived from a stand-alone version of another tool I was using to create cards for myself so it still suffers from a bit of programmer-oriented design.
My idea is to have the card preview look more than the actual card, with an HD preview popping up like a tooltip when hovering with a mouse. Right click for adding cards seems better as well.

Can you attach a screenshot of the "compressed text" you mentioned so I can investigate further? Also, what monitor/window resolution are you using? Are you on windows or linux?