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Level 1 - TSEETR
The answer to this puzzle is:
Words: SETTER, RETEST, TESTER, STERE, TRETS, REEST, ESTER, TERSE, RETE, SETT, TEES, REES, ERST, SERE, TRES, RES, SEE, SER, ERE
Bonus words:
SETTER, RETEST, TESTER, STERE, TRETS, REEST, ESTER, TERSE, RETE, SETT, TEES, REES, ERST, SERE, TRES, RES, SEE, SER, ERE