Filled to the brim with good levels, action and a few scripted events. Sounds, music (very little btw) and monsters are mostly re-used Doom3 and/or expansion, but used very well here. The puzzle elemnets are integrated very nicely, although some ways forward require youto think upwards or donwwards instead of through something. Worth a shot if you have the required games.
Unfortunately this is not the best version of Tyrian. For that you to go to another DRM free retro gaming site. This is the DOsbox'ed version, which is ok, but especially the sound is .. well meh if you heard the OpenTyrian version. Try it anyway, cause its free. If you like; spend a few bucks on one of the the best pc-shooter ever made!