Beta release

I've put the Beta (version 0.5) online. It's still a little rough, but I like having feedback early :)
The first couple levels are playable and there is a basic boss fight (which will be iterated upon in future updates, of course).

There's currently an issue with GUI not scaling when changing between windowed/fullscreen modes. Restarting the game fixes the issue.
Make sure to extract the game folder to somewhere it has write permissions otherwise it cannot store savegames and such.

You may need to download & install the Microsoft Visual C++ Redistributable 2019 Package for Visual Studio 2019, which is freely available from the Microsoft website. These things are usually installed, because anything made with C++ needs a redist installed to run. You'll get an error message if it's not installed :)