If it is already so much cheaper, then I can imagine how much the price can rise if the price changes with such speed.
Yes, the price can change very dramatically. The main thing you need to make sure is that the price will rise up, and will not remain in place after the end of sales.
What is happening with the price now is normal, it will rise and will fall too and will only repeat the cycle, what is improtant and devs needs to do is exert more effore to increase the price and attract more investors to support the project.