Made the same mistake, but support has sorted it out pretty quickly. They did berate me for allegedly "using the wrong BTC address", though
But yes, if you don't type in the very exact amount, your deposit won't go through.
Thought I'd post an update, I put in the support ticket last night. It was a decent amount of money I invested, so I wasn't exactly happy it was just out there floating the in the internet abyss. I woke up this morning and got an email from Leancy Support; "Hello, Corrected and Confirmed. Thank you for using Leancy." At 4:10 in the MORNING. Very impressed. It should take 3 weeks or so to get my investment back! Exciting stuff man!