I seen the first game live on Google hangouts, so as far as game development concerned it is no scam and some people in this topic are jumping to wrong conclusions. The game looked smooth but it was only a short video shooting an opponent, walking up and down, jumping around etc. Could not really conclude anything on the gameplay yet.
Ofcourse, for the other questions and concerns I cannot asnwer, and everyone should do their own evaluation.
Any reason why they wouldn't post at least that short video publicly? Because trolls?

Do you think they can meet the mid-June release date?
Reason was that the video should be pro and not some screencast of hangouts or quick selfish mobile vid. I'd say it is about time to release it, but I don't know the reasons why we don't have it yet.
They said mid-(maybe earl)-june. I have no reason to not think they can, unless they say otherwise. I got no info other than you and everyone have too. I do know, if it is real, they better release a good (bugless) game instead some work-in-progress game.
It has been a long wait, but let's be realistic, crypto projects/it projects never make their deadlines. So I'd say max end of june, otherwise don't wait for it ;-) Personally I did expect it at ION-launch, but guess I was wrong.