Currently the game use Flashplayer. What happens when the engine stops from working and/or is uninstalled by a software upgrade (because Flashplayer's upgrade have been discontinued and PCs are starting to ask to uninstall it)?
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It won't stop working. Flashplayer has already been discontinued for web-browsers but the game is a .exe so it's all good. Newgrounds is also making the newgrounds player which allows you to watch / play flash games on their site. It's a little bit of a hassle to get working ATM but it does work.
Here's the NG player.
https://www.newgrounds.com/flash/player
and Here's the thread to get it working