When it comes to simulation platforms then there are lots but creating another one and tending to teach up some noobs then this wont really be a bad idea.
Site design isnt half bad either but as suggested it would be good if technical indicators or tools are complete like SL or TP's will be a good add up.
I second this. It will be useful for newbies to have an exchange with trading indicators and signals laid out with margin and a fake balance, to avoid making a pointless demo account with some broker, and most brokers you can make demo accounts on for free aren't focused on cryptocurrency trading anyway. I admit indicators may be a difficult feature to implement because they have to be exactly right to be useful, there aren't a lot of open-source implementations of indicators you can reuse or APIs you can connect to that don't cost a lot of money, and of course even without these problems, all of this is a lot of work for one person. So implement what suits you.
I have recently come to this stage of the project and I certainly agree that it will be a nice feature to add so it's also something i'm working on. I totally agree on all fronts regarding other platforms, it seems you have to dive straight into real money trading which can be rather daunting hence why I thought a 'play money' version of a live exchange would be useful for beginners.