I had not heard of the other games at all until you just mentioned them in your post. Right now, I am in the middle of a another overhaul with development. The plans are essentially a main plot exploring the origins of the resort and a dating simulator sub-plot allowing players to enjoy fetish content within the various choices available in the game. The tone of the dating simulation is meant to be lighthearted and cheeky. The main storyline will be a bit more subdued in tone. I thank you for your appreciation of the game. Development is a shade slow at the moment as I have RL affairs fighting with me for time, but I am still plugging away in the background.
Majalis, I cross-referenced the engine you are using for the game and the issue appears to be that the engine requires OpenGL 2.0 support. I do not think there is anything you can do about this particular issue. A lot of older computers that could run the game will not be able to because of how slipshod OpenGL support was ~8-10 years ago. One can assume any computer made during the early Win 7 era and newer should not have an issue, but computers made during the XP/Vista era may only support OpenGL 1.4 or 1.5, preventing those rigs from running the game despite meeting all other system requirements.
OpenGL is the cross-platform alternative to Microsoft's DirectX. The problem with OpenGL is, especially during the mid 2000s, OEMs became ultra-lazy in updating the drvers for graphics cards regarding OpenGL. Likewise, they also skimped on lower end graphics cards by loading them up with older OpenGL tech despite later versions being available. in essence, there are a LOT of computers out there that could run OpenGL 2.0, but cannot because the drivers do not exist. Blizzard is finding this out the hard way with their last Starcraft ptach, which has taken eight iterations to reintegrate DirectX 9.0c again to un-break a 20-year-old game.
It appears that OpenGL 2.0 is required. Trying to run the JAR directly comes up with an OpenGL error, indicating that anything below 2.0 is no longer supported.
