Interesting. Could be a focus issue. If you add command line parameter –native it runs in windowed mode with the native resolution. It's not a great experience as the resolution is so small, but at least you can try to focus the window and see if that fixes the input.
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I've uploaded yet another build that should output more diagnostics in the error window. At the moment I do not really know what the problem is and have been unable to reproduce it I'm afraid.
I've uploaded a new build that prints a little bit more on errors. If you want to try that, perhaps I can understand what is going on. Also the log file will also print other useful information that can help, such as graphics card vendor.
Well Aseprite is only for the graphics when I do my pixel art, the actual engine itself is made by me, and it depends on very little. The reason for going with my own engine is that it's a lot of fun to make things yourself, and I want to program in C++ so Unity and the likes have never really interested me. My current engine is somewhat similar to Unity, but made for 2D pixel perfect graphics and allows you to do all your work in C++, even scripts, which is awesome.
I started a Linux port of the engine some time ago, and got pretty far, but then I kind of lost interest and felt it was better to continue making the actual game instead, so I put it on hold. It's definitely something I want to do at some point in the future, especially so I can get things more easily running on Mac.
As the source is available here https://github.com/darkbitsorg/db-08_green_grappler, a Linux build should not be that hard to make if you want to. As I currently do not really have a proper Linux installation, I cannot supply one at the moment.