This game is an RPGMaker game, which means that it was made in the RPGMaker engine, which is an engine that lets devs make games using pre-built assets like tiles, sprites, etc. However it also means you can't just download it, you have to download the RTP or "Run-Time Package" which contains all of the assets and everything for the specific version of RPGMaker that the game you're trying to play was made with.
You should be able to get the RTP for every version of RPGM off of the official website, linked
You must be registered to see the links
.