I recommend using PollyMC, if you want to play Minecraft for free. It's based on the awesome Prism Launcher, is completely open source, and has more features than the official launcher or TLauncher.
If you want something that's basically the exact same thing as Notepad++, check out Notepad Next. If you want something similar, try Notepadqq, and if you want something better, use Kate. It's developed by the KDE Project btw, and fits in well with the rest of your Plasma desktop experience.
I have installed Lutris (flatpak), Bottles (flatpak) and Heroic (Appimage).
Why did you install Heroic as an AppImage? Just go with the Flatpak, which is more convenient, because you can easily update it from Discover.
https://flathub.org/apps/com.heroicgameslauncher.hgl
I also recommend installing ProtonUp-Qt btw, it's an easy to use graphical tool that lets you manage multiple versions of Proton. Once you have it installed, use it to download the latest version of Proton-GE-custom. It has better performance and compatibility with many games.
When actually installing Linux onto your machine, I would reconsider your choice of distribution though. Debian isn't bad, but there are better, easier, more user-friendly distros for gaming. One example of this is Bazzite. It's pretty similar to Steam OS, and you can't really break it.
OP asked about TLauncher, which is a cracked version. It's proprietary though, and there's a much better alternative called PollyMC. It's based on the amazing Prism Launcher, and has a bunch of useful features, such as the ability to download individual mods and entire modpacks straight from sources like Curseforge, Modrinth, ATLauncher or FTB.