Glad you like the visuals and sound! I gave your 1k minigame a try, it doesn't play quite like Splorf, with the huge walls and the heavy helicopter it felt different to me. The version in the video is a preview, so the difficulty hasn't been tweaked yet. The C64 original works great as it is, and this is intended to be a 2600 port of that game. Adding levels, powerups, lives, etc. would make it a completely different game.