a question that might sound stupid or nonsense: how easily can these games be ported to TIC-80?

http://www.asahi-net.or.jp/~cs8k-cyu/blog/2014/12/12/games-in-2014/

I'm looking at them now and I don't see why you couldn't port games like that to TIC-80 within the restrictions .  I would recommend looking into Moonscript so that the transition is a bit smoother from Haxe since it has a similar object-oriented syntax. It wouldn't be a completely simple port, but if you get a handle on the TIC-80 functionality it would not be terribly difficult.