Renfd Well, frankly, that's what reviews are for. I encourage you to read Kamizoto's comments in the last page or wait until there are more reviews; it's been on the store for under a month and can be a bit complex for some users so it'll take some time. Aside from that, all I can tell you is I've been developing games, prototypes, and tools in Clickteam and Scirra software for over 8 years. I wouldn't put something on the market if it wasn't a solid product through and through.
I have my reasons for not releasing a demo. Another one, if I really must explain myself, is to prevent asset theft, something I've the unfortunate experience of dealing with in the past. It's not exactly rocket science with browser games. People have even gone so far as to rip and doctor assets from my youtube videos!