Your employment rights are protected, but you can still be made redundant. This can’t be just because of the takeover, but might happen as part of a reorganisation afterwards. The redundancy needs to be genuine, not just an excuse to dismiss employees.
Your original employment contract remains in force. If you are made redundant, your redundancy notice and redundancy pay are based on your total length of service since you first started working for the company, not the date of the takeover.
It is not uncommon for employees to be treated unfairly when a company is taken over. You should take legal advice on your particular circumstances.