Thanks for playing!
-Thankfully the mountains are placeholders. The grass textures are also placeholders, but they're low on my list of fixes at the moment.
-Dpad support is planned and will be in the next update, as well as mouse support in the menus. The sensitivity slider will be functional too.
-I only see this as a necessity when exclusively using keyboard+mouse controls, but I'll think about it.
-The Great Wall is planned to have various enemies and collectibles, as well as a mini boss at one point. There's a dashing mechanic that I'll add in the next update. Underwater swimming will be brought back too.
-Can you elaborate on the weapons not being equippable? It works on my computer and my wife's laptop. Only issue I've run into is if you already have the sword in your inventory and you pick up another one, it will cause the weapon hot slots to malfunction.
-I have mirror reflections kind of working, but I want to optimize the shader a bit more before I enable it.
-I agree, water splashes should be called when you enter and exit the water. It's low on my list of additions, but at least it's on the list now.