Having never played the previous episodes, I came into this blind and I am extremely disappointed in what I saw/played. The battle system is very mediocre, a watered down tales of system. The voice acting at times is too low compared the extremely loud audio, the main villain is a sonic recolor (with a very odd name at that), and there are way too many bugs in the battle system itself (such as being able to do Shadows chaos spear while moving around when that shouldn't be possible.)
The animation was alright, it at least had some kind of effort put into it. The system, while mediocre, at least had an idea going, but was very poorly executed. Also I can't believe someone remembers that NiGHTS exists, I'll give you credit for that.
Overall, mediocre and could have had a few adjustments to fix the bugs (maybe get some people to test it next time?)
Also, some of your achievements are not working. Maybe I'm doing something wrong, but they don't seem to activate.