I understand that a lack of communication is enough to scare people, but 9 days of not committing changes to github does not mean they are "inactive". His last commit included multiple fixes. I also received a reply from keccak512 yesterday.
The current hashing power still dedicated to heavycoin is enough to prove that interest isn't dying. There is an investment being made and it will pan out as interest grows and more users understand the power of democratic mining. It's an innovative concept and runs cool on GPUs. Buy heavycoins while you can get them cheap. Don't let the pump and dumpers take control of the market.