Please stop ending your games with absolutely no plot resolution and a big 'To Be Continued' sign.
Yes, I know you want to sell a million sequels and keep churning in the money.
It's really not that hard to give SOME resolution to your story and then add a HOOK for an ending.
But many games these days will, say, be about walking down a staircase, and then at the end of the game you step off the staircase and get a black screen with 'To find out what happens next, buy the sequel!' Which makes it clear there was no point to playing this game in the first place. All you did was walk down a staircase, and you knew about the staircase the second you started. You learned nothing.