A few people have already played it here- including me. It's been uploaded so you can play it- I understand wanting to support the devs and I would too but for some of the same reasons you have-(my cards are refused by dlsite for some reason).. I'm unable to buy things myself even if I wanted. But at least you can still play it.. The game is pretty good- the sprite scenes and characters feel very NTRPG like but the development and path you take through the game is pretty different- it's more guided I suppose.. and the mc doesn't find out until very late anything is happening while NTRPGs mc does but can't do anything to stop it..
Theres a post a while back with some saves- Don't use them just to check scenes- all the fun is the buildup and the thoughts inbetween the scenes, but I had to use them due to a few gamebreaking bugs in the release version of the game(they've been patched out but the versions on the site haven't been updated yet that I know of).. Good luck whatever you decide.
Wish I could buy things- I would get things that haven't been uploaded yet and try to upload them myself- though with my internet it would be really hard to do. There are some games that have come out over the last 3 months that I haven't seen talked about and can't find anywhere but would like to try..
